C 2500 Truck 2WD V8-5.7L VIN R (1997)
Throttle Position Sensor: Testing and Inspection
Throttle Position Sensor (DTCs Set)
The VCM calculates fuel delivery based on throttle valve angle (driver demand). A broken or loose TP sensor may cause intermittent bursts of fuel from
an injector. This may cause an unstable idle because the VCM detects the throttle is moving.
When the VCM detects a malfunction with the TP sensor circuits, the following DTCs will set:
^
DTC P0111 circuit performance malfunction.
^
DTC P0122 circuit low.
^
DTC P0123 circuit high.
^
DTC P1121 intermittent circuit high.
^
DTC P1122 intermittent circuit low.
